What was Alexander Fleming's hypothesis?

Answer 1

Alexander Fleming's hypothesis was that certain molds could produce substances that inhibited the growth of bacteria. This idea emerged after he observed that the mold Penicillium notatum had contaminated one of his bacterial culture plates and resulted in a clear zone around the mold where bacteria could not grow. He proposed that the mold released a substance that could be harnessed as an antibiotic, which later led to the discovery of penicillin. This finding revolutionized medicine by providing a powerful tool to combat bacterial infections.